Mechanical · M-VW4H4

Grease Exhaust Duct Wrap

Materials

Steel Aluminum

Elements

Doors Roofs Ceilings Insulation Connections / Plates Roof / Floor Openings

Connections

Welded Connection

About this detail

A two-hour fire-rated grease duct wrap assembly is suspended by a minimum 3/8-inch hanger rod and a 1-1/2-inch by 1-1/2-inch by 1/8-inch angle saddle. The rectangular duct is wrapped in two layers of fire-rated duct wrap featuring a minimum 3-inch longitudinal overlap and 3-inch perimeter overlap, secured with a minimum 1/2-inch wide steel band or filament tape. An access door assembly is integrated into the duct system using 1/4-inch all-thread rods, insulation pins, speed clips, spool pieces, and 1/4-inch wing nuts, with aluminum tape applied on all edges. The duct system slopes toward the hood at a minimum of 1/4 inch per lineal foot, with a maximum horizontal length of 75 feet, and maintains a minimum thickness of 16 gauge.

NOTICE: 1. PROVIDE ADEQUATE CLEANOUT OPENINGS FOR THOROUGH CLEANING OF DUCT SYSTEM AND PER UMC. 2. THICKNESS OF DUCTS SHALL BE NOT LESS THAN 16 GAGE. 3. WELD OR BRAZE ALL DUCT JOINTS AND SEAMS ON THE EXTERNAL SURFACE. 4. SUPPORT DUCTS AS REQUIRED BY SPECIFICATIONS. DO NOT PENETRATE DUCT WALLS WITH SCREWS, NAILS, ETC. 5. SECTIONS OF DUCT SHALL NOT CONTAIN GREASE POCKETS. 6. FITTINGS SHALL COMPLY WITH SECTION II, SMACNA STANDARDS, LATEST EDITION. 7. PROVIDE ACCESS DOORS EVERY 10'-0" IN GREASE DUCT, FROM HOOD TO EXHAUST FAN. ACCESS DOORS SHALL BE EQUAL TO WARD DUCT CONNECTORS INC., TITAN PDQ OR APPROVED EQUAL. 8. DUCT ENCLOSURE MATERIALS AND INSTALLATION SHALL COMPLY IN ALL RESPECTS WITH APPLICABLE SECTIONS OF THE LATEST EDITION OF UMC. ROOF 2 HR DUCT WRAP DETAIL NOTICE: 1)FIELD APPLIED OR FACTORY-BUILT GREASE DUCT ENCLOSURE SHALL BE INSTALLED PER THE LATEST MANUFACTURER'S INSTALLATION INSTRUCTIONS AND IN COMPLIANCE WITH TERMS OF ITS LISTING. 2) ALL END CUTS OR CUTS IN THE FOIL JACKET OF FIELD APPLIED GREASE DUCT ENCLOSURE SHALL BE SEALED PER THE MANUFACTURER'S RECOMMENDATIONS. 3) ALL INSTALLATIONS SHALL BE COMPLETELY ACCESSIBLE FOR VISUAL INSPECTION. 4) AT TIME OF INSPECTION, THE FIELD APPLIED OR FACTORY BUILT GREASE DUCT ENCLOSURE INSTALLATION INSTRUCTIONS SHALL BE MADE AVAILABLE AT THE JOB SITE. 1/2" WIDE MINIMUM STEEL BAND/FILAMENT TAPE 3" MINIMUM LONGITUDINAL OVERLAP "FIREMASTER" DUCT WRAP (OR SIMILAR) - TWO LAYERS 3/8~ MINIMUM HANGER ROD (TYPICAL) 1-1/2" x 1-1/2" x 1/8" ANGLE SADDLE 3" MINIMUM PERIMETER OVERLAP ROOF PENETRATION HOOD (BY OTHERS) HOOD CONNECTION CEILING "FIREMASTER" DUCT WRAP (OR SIMILAR) - SEE DETAIL ON THE RIGHT SLOPE DUCT TO HOOD MINIMUM 1/4" PER LINEAL FOOT (75'-0" MAXIMUM HORIZONTAL LENGTH) ONE LAYER DUCT WRAP - CUT SAME SIZE AS COVER 1/4" WING NUTS SPOOL PIECES FOR THREADED RODS SPEED CLIPS ONE LAYER DUCT WRAP WITH 1" OVERLAP - ALL SIDES ALUMINUM TAPE ON ALL EDGES INSULATION PINS ACCESS COVER 1/4" ALL-THREAD RODS ACCESS HOLE EVERY 10'-0" AND PER UMC

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